Service difficulty report · Skin · Boeing 73771B

Difficulty date
February 28, 2023
Submitted
March 10, 2023
Operation
Air carrier
Aircraft
N7854B
Make and model
Boeing 73771B
Aircraft serial
29372
Aircraft time
46,419 hours, 30,967 cycles
Part
Skin
Condition
Corroded
Location
Zn 100 Fus Lower
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FOUND CORROSION AT BS1016 BETWEEN S20L-S21L MEASURING .5'X.5' REF: TTG8Q00J55UF<[01] SRM 53-70-01-2R-4 IS FOUND TO BE APPLICABLE;[02] PERFORMED DAMAGE CUTOUT ON FUSELAGE SKIN BS 1016 STR 21L L=3.2'XW=2.9'. IAW SRM 53-70-01-2R-4 STEPS 4.B.(1-2).;[18] INSTALLED 100% PERMANENT AND TEMPORARY FASTENERS PRIOR TO SEALANT SQUEEZE OUT TIME AT 23:00 UTC IAW SRM 53-70-01-2R-4 STEPS 4.L AND SRM 51-40-02.;[19] VERIFIED CORRECTIVE ACTION #18.;[20] INSTALLED 100% OF PERMANENT FASTENERS ON REPAIR PARTS; [1] DOUBLER; [2] STRUCTURAL FILLER AND [3] STRUCTURAL FILLER BETWEEN STR L-20 TO STR L-24 AND BETWEEN BS1006 TO BS1016.APPLIED AERODYNAMIC FILLET SEAL ALL AROUND THE PERIPHERY OF AREA COMMON TO REPAIR; PER SRM 53-70-01-2R-4; REPAIR 4 STEPS L; M; N; O & P.;[21] VERIFIED CORRECTIVE ACTION #20;[22] APPLIED A LAYER OF BMS 3-23; CORROSION INHIBITING COMPOUND TO ALL THE INTERNAL STRUCTURE IN THE REPAIR AREA IAW SRM 53-70-01-2R-4 STEP 4. Q;[23] VERIFIED CORRECTIVE ACTION #22;[24] VERIFIED TASK COMPLETE

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